.rotateDown {
  -webkit-animation-name: rotateDown;
          animation-name: rotateDown;
}
@-webkit-keyframes rotateDown {
  0% {
    opacity: 1;
    -webkit-transform-origin: 0 0;
            transform-origin: 0 0;
    -webkit-transform: perspective(800px) rotateX(0deg) translateZ(0px);
            transform: perspective(800px) rotateX(0deg) translateZ(0px);
  }

  100% {
    opacity: 0;
    -webkit-transform-origin: 50% 100%;
            transform-origin: 50% 100%;
    -webkit-transform: perspective(800px) rotateX(-180deg) translateZ(300px);
            transform: perspective(800px) rotateX(-180deg) translateZ(300px);
  }
}
@keyframes rotateDown {
  0% {
    opacity: 1;
    -webkit-transform-origin: 0 0;
            transform-origin: 0 0;
    -webkit-transform: perspective(800px) rotateX(0deg) translateZ(0px);
            transform: perspective(800px) rotateX(0deg) translateZ(0px);
  }

  100% {
    opacity: 0;
    -webkit-transform-origin: 50% 100%;
            transform-origin: 50% 100%;
    -webkit-transform: perspective(800px) rotateX(-180deg) translateZ(300px);
            transform: perspective(800px) rotateX(-180deg) translateZ(300px);
  }
}